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In Reply to: RE: Garg0yle 2A3 DC posted by Garg0yle on January 19, 2015 at 13:59:27
Thirteen henries is moderately low for a 2.5K transformer; that can give you perceptibly weak bass, especially at high levels. The Hammond 125ESE is spec'd at 10 henries. I like to go for 20 henries at 2500 ohms; beyond that you get big transformers with questionable treble - in my experience at least.
I totally agree that better power supplies make better music. A shunt regulator for this amp would be a beautiful thing. But in series feed you need ore current through the shunt reg than through the amp itself, so the regulator will dissipate at least 30 watts - no longer a simple, inexpensive project!
Incidentally, I did not design this for parallel feed even though I personally prefer it. A lot of people seem uncomfortable with it. But it does provide a good measure of power supply isolation.
Follow Ups:
"Thirteen henries is moderately low for a 2.5K transformer; that can give you perceptibly weak bass, especially at high levels. The Hammond 125ESE is spec'd at 10 henries. I like to go for 20 henries at 2500 ohms; beyond that you get big transformers with questionable treble - in my experience at least."
The OP transformers do have a 3.5K - 18H @ 80mA taps along with variable 25W cathode resistors.
"I totally agree that better power supplies make better music. A shunt regulator for this amp would be a beautiful thing. But in series feed you need ore current through the shunt reg than through the amp itself, so the regulator will dissipate at least 30 watts - no longer a simple, inexpensive project!"
That's OK, I'm confident something can can be worked out with what you have here. IMO
"Incidentally, I did not design this for parallel feed even though I personally prefer it. A lot of people seem uncomfortable with it. But it does provide a good measure of power supply isolation."
I was somewhat interested in parallel, although I already had these OPTs, so just as well for myself!
What counts is the ratio of inductance to impedance, which is the same on both taps.
"What counts is the ratio of inductance to impedance, which is the same on both taps."
-OK Gotcha.
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